The politics of Houston in the U.S. state of Texas are complex and constantly shifting in part because the city is one of the fastest growing major cities in the United States and is the largest without zoning laws. Houston was founded in 1836 and incorporated in 1837. The city is the county seat of Harris County. A portion of southwest Houston extends into Fort Bend County and a small portion in the northeast extends into Montgomery County. The city of Houston has a strong mayor–council government. The City's elected officials, serving four-year terms, are: the mayor, the city comptroller and 16 members of the city council. Under the strong mayor-council government, the mayor serves as the executive officer of the city. As the city's chief administrator and official representative, the mayor is responsible for the general management of the city and for seeing that all laws and ordinances are enforced. As the result of a 1991 referendum in Houston, the two-year term was amended to elected officials who can serve up to three terms until 2015 where the three-term limit and two-year terms were replaced with a two four-year terms – a mayor is elected for a four-year term (previously the mayor, controller, and councilmembers are elected to a two-year term prior to the November 3, 2015 city elections), and can be elected to as many as two consecutive terms. City council members, who also have a three-term limit, are elected from eleven districts in the city, along with five at-large council members, who represent the entire city. Term limits with the City of Houston are absolute – past elected officeholders are prohibited from campaigning for their former council positions (which includes the mayor and city controller). The current mayor of Houston is Sylvester Turner. The city council lineup was based on a U.S. Justice Department mandate which took effect in 1979. Under the current city charter, when the population in the Houston city limits passed 2.2 million residents, the nine-member city council districts expanded to include two more city council districts. The municipal elections held on November 8, 2011, included the newly formed Districts J (located in the Greater Sharpstown area) and K (a section of Southwest Houston, Reliant Park, and Fort Bend County located within the Houston City Limits) where 2 candidates won over 50% of the vote. Houston is a home rule city and all municipal